From: Prarit Bhargava <prarit@xxxxxxxxxx> [ Upstream commit 6d6daa20945f3f598e56e18d1f926c08754f5801 ] hswep_uncore_cpu_init() uses a hardcoded physical package id 0 for the boot cpu. This works as long as the boot CPU is actually on the physical package 0, which is normaly the case after power on / reboot. But it fails with a NULL pointer dereference when a kdump kernel is started on a secondary socket which has a different physical package id because the locigal package translation for physical package 0 does not exist. Use the logical package id of the boot cpu instead of hard coded 0. [ tglx: Rewrote changelog once more ] Fixes: cf6d445f6897 ("perf/x86/uncore: Track packages, not per CPU data") Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx> Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Harish Chegondi <harish.chegondi@xxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Kan Liang <kan.liang@xxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Stephane Eranian <eranian@xxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Vince Weaver <vincent.weaver@xxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Link: http://lkml.kernel.org/r/1483628965-2890-1-git-send-email-prarit@xxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> --- arch/x86/events/intel/uncore_snbep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c index 272427700d48..afe8024e9e95 100644 --- a/arch/x86/events/intel/uncore_snbep.c +++ b/arch/x86/events/intel/uncore_snbep.c @@ -2686,7 +2686,7 @@ static struct intel_uncore_type *hswep_msr_uncores[] = { void hswep_uncore_cpu_init(void) { - int pkg = topology_phys_to_logical_pkg(0); + int pkg = boot_cpu_data.logical_proc_id; if (hswep_uncore_cbox.num_boxes > boot_cpu_data.x86_max_cores) hswep_uncore_cbox.num_boxes = boot_cpu_data.x86_max_cores; -- 2.11.0